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either way then you can do that, just make sure that the stick of ram are of the right sort for your type of motherboard.

?Usually they have pc133 etc on the stick of ram.
So just check with the sticks that you already have, and see if you can spot there frequency and then go into the shop and get the ram with the same frequency.

Someone might be able to offer more detail, as i am to tired to really think at the moment yaaawn.
f2B

you might want to confirm just exactly what RAM type you DO have installed
as cheap RAM that doesn't fit is an expensive addition

As you are using 64MB sticks now, I would assume that they are SDRRAM [Synchronous Data Rate RAM]
and not DDRRAM [Double Data Rate RAM]

so RIMM would NOT fit these

only way I can think of at the moment is to open box, remove a stick and physically examine it

if you haven't had the 'pleasure' of swapping RAM then click here for a quick guide as to the do's and dont's

HTH
Pax

[edit]
in answer to your question
pulling out two 64's and replacing with a single 128 will leave the system [overall] exactly the same
so MOST people would pull the 4x64's and replace with a couple of sticks of compatable 256 / 512 thereby giving your system a quick speed upgrade
and giving you 4 sticks of RAM for the stockpile

55 - I'm fiftyfeckinfive and STILL no wiser,
OLDER yes
Beware of Geeks bearing GIF's
come and waste the day :P at The Taz Zone

You need to insert the memory in matched pairs and you need continuity strips in any unused slots.

My machine has 2 x 128 and 2 x 256 strips.

So, you will need to take out 2 of your 64's

I am surprised that you are offered anything other than matched pairs. Perhaps you should check that out with the shop.

If you are offered single RIMMS the implication is that something nasty has happened to its companion

EDIT: You could take a look in your computer or motherboard manual................there is usually a RAM compatibility chart/table. Or try a memory supplier's "finder" software.

There are a very few PCs that will support RAMBUS memory not being inserted in pairs. Others have a specific insertion sequence.

Given that you have matched strips in there already, I would say it is of the type that requires matching, after all you would not put in the second pair of 64's if a 128 would do the job?

If you cannot do someone any good: don't do them any harm....
As long as you did this to one of these, the least of my little ones............you did it unto Me.
What profiteth a man if he gains the entire World at the expense of his immortal soul?